253421940 has 24 divisors (see below), whose sum is σ = 709581600. Its totient is φ = 67579168.

The previous prime is 253421929. The next prime is 253421951. The reversal of 253421940 is 49124352.

It is an interprime number because it is at equal distance from previous prime (253421929) and next prime (253421951).

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

It is a junction number, because it is equal to n+sod(n) for n = 253421898 and 253421907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2111790 + ... + 2111909.

It is an arithmetic number, because the mean of its divisors is an integer number (29565900).

Almost surely, 2^253421940 is an apocalyptic number.

253421940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

253421940 is an abundant number, since it is smaller than the sum of its proper divisors (456159660).

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

253421940 is a wasteful number, since it uses less digits than its factorization.

253421940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4223711 (or 4223709 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 253421940 is about 15919.2317653837. The cubic root of 253421940 is about 632.8217592488.

The spelling of 253421940 in words is "two hundred fifty-three million, four hundred twenty-one thousand, nine hundred forty".