1245221940 has 24 divisors (see below), whose sum is σ = 3486621600. Its totient is φ = 332059168.

The previous prime is 1245221921. The next prime is 1245221951. The reversal of 1245221940 is 491225421.

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 = 1245221898 and 1245221907.

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, 10376790 + ... + 10376909.

It is an arithmetic number, because the mean of its divisors is an integer number (145275900).

Almost surely, 2^1245221940 is an apocalyptic number.

1245221940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245221940 is an abundant number, since it is smaller than the sum of its proper divisors (2241399660).

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

1245221940 is a wasteful number, since it uses less digits than its factorization.

1245221940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20753711 (or 20753709 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1245221940 is about 35287.7023904929. The cubic root of 1245221940 is about 1075.8430567152.

The spelling of 1245221940 in words is "one billion, two hundred forty-five million, two hundred twenty-one thousand, nine hundred forty".