400020767 has 4 divisors (see below), whose sum is σ = 406800840. Its totient is φ = 393240696.

The previous prime is 400020749. The next prime is 400020769. The reversal of 400020767 is 767020004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400020767 - 2¹⁰ = 400019743 is a prime.

It is a super-2 number, since 2×400020767² = 320033228062536578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400020769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3389948 + ... + 3390065.

It is an arithmetic number, because the mean of its divisors is an integer number (101700210).

Almost surely, 2^400020767 is an apocalyptic number.

400020767 is a deficient number, since it is larger than the sum of its proper divisors (6780073).

400020767 is an equidigital number, since it uses as much as digits as its factorization.

400020767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6780072.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 400020767 is about 20000.5191682616. The cubic root of 400020767 is about 736.8190505544.

The spelling of 400020767 in words is "four hundred million, twenty thousand, seven hundred sixty-seven".