1972290 has 32 divisors (see below), whose sum is σ = 4898880. Its totient is φ = 507584.

The previous prime is 1972283. The next prime is 1972291. The reversal of 1972290 is 922791.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1972291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264 + ... + 2003.

It is an arithmetic number, because the mean of its divisors is an integer number (153090).

2^1972290 is an apocalyptic number.

1972290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1972290 is an abundant number, since it is smaller than the sum of its proper divisors (2926590).

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

1972290 is a wasteful number, since it uses less digits than its factorization.

1972290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 1972290 is about 1404.3824265491. The cubic root of 1972290 is about 125.4075232877.

The spelling of 1972290 in words is "one million, nine hundred seventy-two thousand, two hundred ninety".