1025415440 has 80 divisors (see below), whose sum is σ = 2843175168. Its totient is φ = 336281088.

The previous prime is 1025415431. The next prime is 1025415473. The reversal of 1025415440 is 445145201.

It is a tau number, because it is divible by the number of its divisors (80).

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, 26927 + ... + 52686.

Almost surely, 2^1025415440 is an apocalyptic number.

1025415440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1025415440 is an abundant number, since it is smaller than the sum of its proper divisors (1817759728).

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

1025415440 is a wasteful number, since it uses less digits than its factorization.

1025415440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79656 (or 79650 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 1025415440 is about 32022.1086126445. The cubic root of 1025415440 is about 1008.4010382484.

The spelling of 1025415440 in words is "one billion, twenty-five million, four hundred fifteen thousand, four hundred forty".