1780291725 has 12 divisors (see below), whose sum is σ = 2943415776. Its totient is φ = 949488880.

The previous prime is 1780291699. The next prime is 1780291727. The reversal of 1780291725 is 5271920871.

It is not a de Polignac number, because 1780291725 - 2⁵ = 1780291693 is a prime.

It is a super-2 number, since 2×1780291725² = 6338877252206951250, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780291727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11868537 + ... + 11868686.

It is an arithmetic number, because the mean of its divisors is an integer number (245284648).

Almost surely, 2^1780291725 is an apocalyptic number.

1780291725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1780291725 is a deficient number, since it is larger than the sum of its proper divisors (1163124051).

1780291725 is a wasteful number, since it uses less digits than its factorization.

1780291725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23737236 (or 23737231 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 42.

The square root of 1780291725 is about 42193.5033506344. The cubic root of 1780291725 is about 1211.9844777663.

The spelling of 1780291725 in words is "one billion, seven hundred eighty million, two hundred ninety-one thousand, seven hundred twenty-five".