1423155540 has 48 divisors (see below), whose sum is σ = 3986474688. Its totient is φ = 379352064.

The previous prime is 1423155497. The next prime is 1423155577. The reversal of 1423155540 is 455513241.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1423155498 and 1423155507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273604 + ... + 278756.

It is an arithmetic number, because the mean of its divisors is an integer number (83051556).

Almost surely, 2^1423155540 is an apocalyptic number.

1423155540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1423155540 is an abundant number, since it is smaller than the sum of its proper divisors (2563319148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1423155540 is a wasteful number, since it uses less digits than its factorization.

1423155540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9768 (or 9766 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 1423155540 is about 37724.7337962775. The cubic root of 1423155540 is about 1124.8228303717.

Adding to 1423155540 its reverse (455513241), we get a palindrome (1878668781).

The spelling of 1423155540 in words is "one billion, four hundred twenty-three million, one hundred fifty-five thousand, five hundred forty".