25401555 has 48 divisors (see below), whose sum is σ = 46126080. Its totient is φ = 12916800.

The previous prime is 25401539. The next prime is 25401583. The reversal of 25401555 is 55510452.

It is not a de Polignac number, because 25401555 - 2⁴ = 25401539 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 182676 + ... + 182814.

It is an arithmetic number, because the mean of its divisors is an integer number (960960).

Almost surely, 2^25401555 is an apocalyptic number.

25401555 is a deficient number, since it is larger than the sum of its proper divisors (20724525).

25401555 is a wasteful number, since it uses less digits than its factorization.

25401555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 25401555 is about 5039.9955357123. The cubic root of 25401555 is about 293.9590044185.

It can be divided in two parts, 2540 and 1555, that added together give a triangular number (4095 = T₉₀).

The spelling of 25401555 in words is "twenty-five million, four hundred one thousand, five hundred fifty-five".